#include <iostream>
#include<string>
#include<vector>
using namespace std;
class Solution {
public:
    vector<string> letterCombinations(string digits)
    {
        vector<string> tmp;
        vector<string> ret;
        int count=8;
        char * letter="abcdefghijklmnopqrstuvwxyz";


        while(count--)//映射插入
        {
            if(count==2||count==0)//控制每个7的插入与9的插入
            {
                tmp.push_back(string(letter,4));
                letter+=4;
            }
            else
            {
                tmp.push_back(string(letter,3));
                letter+=3;
            }
        }

        //俩种情况
        //1:一位数的时候
        //2:多位数的情况
        while(!digits.empty())
        {
            //情况1
            if(digits.size()==1)
            {

            }


            //情况二


        }
    }
};
int main()
{
    Solution d1;
    d1.letterCombinations(string("2"));
    return 0;
}
